Other people have mentioned how to access password protected pages from a Perl script as a client. Is this what you are asking about?
Or do you want a HTML login form and CGI script that provides access to a password protected site? It is possible to have a CGI script redirect to a URL containing the username and password.
my $url = 'http://' . $username . ':' . $password '@' . 'www.example.c
+om/some_page.html';
print $cgi->redirect($url);
The problems are that this exposes the password in the URL bar. Putting it in frames can make it less obvious but it is still there. Also, a recent update to IE removes all support for usernames and passwords in http URLs. This completely stops any login script from working.
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